JP5624111B2 - Stator for rotating electric machine having regulating member for preventing deformation of coil end and electric motor provided with the stator - Google Patents

Description

  The present invention relates to a stator of a rotating electric machine and an electric motor including the stator.

  A stator used in a rotating electric machine such as a rotating motor includes a coil wound around a slot of a stator core. The coil has a coil end protruding outward from the end face of the stator core. The coil end is fixed in a plastically deformed state so as not to be deformed inward in the radial direction in order to secure an insulation distance. Patent document 1 is disclosing the apparatus which deform | transforms a coil end to radial direction outer side.

JP-A-5-304748

  There is a demand for a stator that can prevent the coil end of the stator from being deformed radially inward by a simple method.

According to a first aspect of the present invention, there is provided a rotary electric machine comprising: a stator core having a plurality of slots extending in the axial direction at intervals in the circumferential direction; and a coil wound through the slots. The stator includes a coil end that protrudes axially outward from an end surface of the stator core, and the stator prevents the coil end from being deformed radially inward. A stator of a rotating electrical machine is provided with a regulating member provided radially inward of the coil end, and the stator core has an attachment mechanism portion for attaching a binding member that binds the regulating member and the coil end in an axial direction. Provided.

  According to a second invention of the present application, in the first invention, the regulating member has a cylindrical shape, and a diameter at one end is larger than a diameter at the other end. A stator is provided.

  In the third invention of the present application, in the first or second invention, the restriction member has a flange extending radially outward so as to cover the end of the coil end at one end. A stator is provided.

In the fourth invention in the present application, in any of the first to third aspects, the coil end and the regulation member is coated with a molding resin, the stator is provided.

In the fifth aspect of the present application, it comprises a rotor to a stator and stator cooperating according to any one of the first to fourth aspects, the electric motor is provided.

  According to the invention in the present application described above, the coil end having a desired shape can be formed by the regulating member without requiring a special device as in the known technique disclosed in Patent Document 1. Further, even when the force acts on the coil end toward the inner side in the radial direction, the regulating member can prevent the deformation of the coil end and maintain the insulation distance inside the coil end.

It is a disassembled perspective view which shows the stator which concerns on embodiment of this invention. It is a perspective view which shows the stator of the state to which the limitation member was attached. It is a perspective view which shows the stator of the state to which the binding member was attached. It is a perspective view which shows a control member. It is sectional drawing seen along line 4B-4B of FIG. 4A. It is a perspective view which shows the stator which concerns on another embodiment of this invention. It is the elements on larger scale which show the attachment mechanism part of a binding member. It is a perspective view which shows the structural example of a control member. It is sectional drawing seen along line 7B-7B of FIG. 7A. It is a perspective view which shows the structural example of a control member. It is a front view which shows the control member of FIG. 8A . It is a perspective view which shows the structural example of a control member. It is a top view which shows the control member of FIG. 9A. It is a perspective view which shows the structural example of a control member. It is sectional drawing seen along line 10B-10B of FIG. 10A. It is a top view which shows the example of a stator core.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that the components of the illustrated embodiment may have been scaled from practical form to aid in understanding the present invention.

  With reference to FIGS. 1-3, the stator 10 which concerns on embodiment of this invention is demonstrated. FIG. 1 is an exploded perspective view showing the stator 10. FIG. 2 is a perspective view showing the stator 10 with the regulating member 30 attached thereto. FIG. 3 is a perspective view showing the stator 10 with the binding member 40 attached thereto.

  The stator 10 is used with a rotor (not shown) in a rotary electric machine such as a rotary electric motor. The stator 10 includes a stator core 12 formed by stacking steel plates and a coil wound around a slot formed in the stator core 12. For example, a three-phase alternating current is applied to the coil, thereby generating a rotating magnetic field. Rotational power for rotating the rotor is obtained by a magnetic interaction between the rotating magnetic field generated on the stator side and the rotor.

  Although the shape of the stator core 12 of the stator 10 is not particularly limited, a configuration example of the stator core 12 will be described with reference to FIG. FIG. 11 is a plan view showing an example of the stator core 12. The stator core 12 has a plurality of teeth 14 protruding inward in the radial direction at predetermined intervals in the circumferential direction. Between adjacent teeth 14, a slot 16 extending in the axial direction (that is, a direction orthogonal to the paper surface) is formed. The wires forming the coils of the stator 10 are wound along the side surfaces of the teeth 14 through the slots 16.

  The coil is formed according to a known winding method such as concentrated winding or distributed winding. Referring to FIG. 1, the coil has a coil end 20 that protrudes outward in the axial direction O from the end surface 12 a of the stator core 12. In FIG. 1, the coil end 20 is depicted as a cylindrical member for simplicity.

  The regulating member 30 is made of a material that is difficult to deform, such as plastic, and has a generally cylindrical shape. As can be better understood with reference to FIGS. 4A and 4B, the restriction member 30 has a diameter at the first end 30a distal to the stator core 12 that is greater than the diameter at the other second end 30b. It is formed to be large. The side surface 32 of the restricting member 30 has a substantially arc-shaped cross section, whereby the diameter continuously increases from the second end 30b toward the first end 30a.

  The regulating member 30 is attached to the stator 10 by being pushed into the space inside the coil end 20 in the radial direction along the axial direction O. As a result, in the state where the regulating member 30 is attached to the stator 10 as shown in FIG. 2, the coil end 20 gradually increases in diameter as the coil end 20 moves away from the end surface 12 a of the stator core 12. Is deformed. The side surface 32 of the regulating member 30 has a predetermined shape corresponding to the desired shape of the coil end 20. Accordingly, when the regulating member 30 is attached to the stator 10, the coil end 20 having a desired shape is formed by deforming the shape of the coil end 20 along the side surface 32 of the regulating member 30.

  As described above, the coil end 20 is deformed according to the shape of the side surface 32 of the restricting member 30, and as a result, has a desired shape. According to such a method, a special apparatus is not required unlike the known technique disclosed in Patent Document 1 described above. This eliminates the need for space and equipment necessary for installation and operation of the apparatus, thereby reducing costs. In addition, processes related to the handling of the apparatus can be reduced, and work efficiency is improved. Moreover, since there is little possibility of damaging the electric wire of a coil compared with the case where a coil end is shaped using a jig | tool, a more reliable stator is provided.

  In a state where the regulating member 30 is disposed at a predetermined position, the regulating member 30 and the coil end 20 are fixed together by a binding member 40 as shown in FIG. In the illustrated embodiment, the binding member 40 is formed from a horizontal string 42 and a vertical string 44. The horizontal cord 42 is wound over the entire circumference of the coil end 20 and has a function of binding the coil end 20 and the regulating member 30 to each other in the radial direction. On the other hand, the vertical cord 44 is provided in the axial direction O so as to be wound around the inner surface 34 of the regulating member 30 and the coil end 20. The vertical cord 44 has an action of binding the coil end 20 and the regulating member 30 to each other in the axial direction O. Further, the horizontal cord 42 and the vertical cord 44 are connected to each other, and hold the coil end 20 and the regulating member 30 at predetermined positions both in the axial direction and in the radial direction.

  The binding member used in the embodiment of the present invention is not limited to the specific form shown. For example, although the illustrated vertical cord 44 is provided substantially along the axial direction O, it may be wound around the coil end 20 so as to be inclined with respect to the axial direction O. Alternatively, a binding band such as a tie wrap may be used as the vertical string. The number of binding members is not limited to a specific aspect, and is determined as necessary. In addition, other known modes can be similarly adopted as the binding member.

  In one embodiment, the coil end 20 and the regulating member 30 may be covered with a mold resin. Since the mold resin fixes the coil end 20 and the regulating member 30 together, positional deviation of the coil end 20 and the regulating member 30 can be prevented. The mold resin is formed over a range necessary for fixing the coil end 20 and the regulating member 30 with a mold or other jig. The mold resin may be formed in a state where the binding member is attached, or may be formed without attaching the binding member.

  As described above, according to the present embodiment, it is possible to prevent the coil end from being deformed radially inward by disposing the regulating member on the radially inner side of the coil end. Therefore, since the insulation distance inside the coil end is ensured, a highly reliable stator is provided. Further, since the coil end having a desired shape can be easily formed by deforming the coil end in accordance with the shape of the restricting member, no special device or skilled technique is required. Moreover, since there is no possibility of deforming the coil end more than necessary, damage to the coil end can be prevented. As described above, by simplifying the coil end shaping work, the work efficiency is improved and the cost is reduced.

  Subsequently, another embodiment of the present invention different from the above-described embodiment will be described. In the following description, the description overlapping with the contents already described will be omitted as appropriate. The same reference numerals are used for the same or corresponding components.

  FIG. 5 is a perspective view showing a stator 10 ′ according to another embodiment of the present invention. In the stator 10 ′ according to the present embodiment, the configuration of the binding member 50 that binds the coil end 20 and the regulating member 30 to each other is different from the binding member 40 of the embodiment described above with reference to FIGS. 1 to 3. The binding member 50 is a generally annular string. The binding member 50 is fixed by, for example, an attachment mechanism 60 formed on the end surface 12a of the stator core 12 while being wound around the coil end 20 and the regulating member 30.

  FIG. 6 is a partially enlarged view showing the attachment mechanism portion 60 of the binding member 50. A first arc portion 50a extending over a part of the arc of the binding member 50 and a second arc portion 50b located on the diametrically opposite side from the first arc portion 50a are hooked on the attachment mechanism portion 60. And locked. Thereby, the binding member 50 is attached in a state where the coil end 20 and the regulating member 30 are fixed to each other. In the illustrated embodiment, the attachment mechanism portion 60 has a hook shape that protrudes to the outside of the end surface 12 a of the stator core 12. For example, the attachment mechanism portion 60 is formed by cutting a part of a steel plate used to form the end face 12a of the stator core 12 into a “U” shape, and a portion cut into the “U” shape as an end face. It is formed by bending in an “L” shape with respect to 12a. Alternatively, the attachment mechanism portion 60 may be formed from a member separate from the stator core 12. Needless to say, the attachment mechanism for assisting the attachment of the bundling member is not limited to any of the specific shape, arrangement, and number shown.

  With reference to FIGS. 7-10, the other structural example of a control member is demonstrated. The restriction member 70 shown in FIGS. 7A and 7B is a modification of the restriction member 30 shown in FIGS. 4A and 4B. The restriction member 70 is formed so that the diameter at the first end portion 70a is larger than the diameter at the second end portion 70b, similarly to the restriction member 30 described above. However, the regulating member 70 has a vertical side surface 72 extending in the vertical direction so as to have a constant diameter in the vicinity of the second end portion 70b, and a diameter from the end portion of the vertical side surface 72 toward the first end portion 70a. And an inclined side surface 74 which is inclined so as to continuously expand.

  The restricting member 80 shown in FIGS. 8A and 8B is the same as the other restricting members in that the diameter at the first end 80a is larger than the diameter at the second end 80b. . However, the regulating member 80 has a stepped side surface 82 so as to have a diameter that gradually increases from the second end 80b toward the first end 80a.

  The restriction member 90 shown in FIGS. 9A and 9B is the same as the other restriction members in that the diameter at the first end 90a is larger than the diameter at the second end 90b. . However, in the restricting member 90, the peripheral wall portion 92 has a regular polygonal shape, for example, a regular decagonal shape in plan view (see FIG. 9B). A side surface 92a of the peripheral wall portion 92 is inclined between the first end portion 90a and the second end portion 90b.

  The restriction member 100 shown in FIGS. 10A and 10B includes a substantially cylindrical side wall 102 and a flange 104 that extends radially outward at one end portion 100a of the restriction member 100. The flange 104 projects from the side wall 102 for a length sufficient to at least partially cover the end of the stator coil end, for example. Therefore, in a state where the regulating member 100 is attached to the inside of the coil end in the radial direction, the coil end is at least partially hidden by the regulating member 100 in a plan view. In this way, the regulating member 100 including the flange 104 extending radially outward has an effect of regulating the position of the coil end in the height direction (that is, the axial direction). Thereby, the insulation distance in the edge part of a coil end is ensured. Further, the flange 104 of the regulating member 100 is formed so as to at least partially cover the end portion of the coil end, and thus has an action of protecting the coil end. Such a flange can be arbitrarily formed on any of the regulating members 30, 70, 80, 90 according to the other embodiments described above. Thereby, the effects as described above can be obtained similarly.

  A coil end having a desired shape can be formed using any of the regulating members 70, 80, 90, 100 having the various configurations described above with reference to FIGS. 4 and 7 to 10, and The deformation of the coil end inward in the radial direction can be prevented. It should be noted that these various restricting members are examples, and the restricting members that can be employed in the present invention are not limited to the specific shapes of restricting members illustrated.

  Although various embodiments of the present invention have been described above, it will be understood by those skilled in the art that the present invention can be implemented by arbitrarily combining features of the embodiments disclosed explicitly or implicitly in this specification. Obviously, any combination of such embodiments is also within the scope of the disclosure herein.

DESCRIPTION OF SYMBOLS 10 Stator 10 'Stator 12 Stator core 12a End surface of stator core 16 Slot 20 Coil end 30 Restriction member 40 Binding member 50 Binding member 60 Mounting mechanism part 70 Restriction member 80 Restriction member 90 Restriction member 100 Restriction member 104 Flange O Axial direction

Claims (5)

A stator of a rotating electrical machine comprising: a stator core having a plurality of slots extending in the axial direction at intervals in the circumferential direction; and a coil wound through the slots,
The coil has a coil end protruding outward in the axial direction from the end face of the stator core,
The stator includes a regulating member that prevents the coil end from being deformed radially inward, on the radially inner side of the coil end ,
The stator of a rotating electrical machine, wherein the stator core includes an attachment mechanism portion for attaching a binding member that binds the restriction member and the coil end in the axial direction .   The stator according to claim 1, wherein the regulating member has a cylindrical shape, and a diameter at one end is larger than a diameter at the other end.   3. The stator according to claim 1, wherein the restricting member has a flange that extends radially outward so as to cover an end of the coil end at one end. The stator according to any one of claims 1 to 3, wherein the coil end and the regulating member are covered with a mold resin. An electric motor comprising the stator according to any one of claims 1 to 4 and a rotor that cooperates with the stator.

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